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Psst...don't tell anyone, but we have a new release candidate for Synapse v0.99.0rc2, v0.99 is the final minor version ahead of the upcoming v1.0 release. It contains all the S2S r0 API work which we need to test before declaring 1.0, help much appreciated https://github.com/matrix-org/synapse/releases/tag/v0.99.0rc2
